Tile unit



FIG. 1 is a top plan view of a tile unit showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is an enlarged top plan view showing a single tile unit showing in FIG. 1;

FIG. 4 is a cross-sectional view taken along line 4--4 of FIG. 3; and

FIG. 5 is a fragmentary top perspective view thereof. 

The ornamental design for a tile unit, as shown and described. 